This is what the article says of the new twin-turbocharged 330 bhp 3.0L inline-six:

" ‘It’s going to take turbocharging to a whole new level,’ said a supplier privy to the new engine’s performance claims. Nothing’s official, but a 0-60mph time of around 6.0sec appears to be on the cards with top speed limited to 155mph."

Our current 330i has performance on par with that, so it's apparent the author of this article has his information a bit mixed up.